It is highly unlikely that pears could cause constipation, and in fact they are likely to have the opposite effect. Due to the high amount of fiber that pears contain, they are sometimes used as a remedy for constipation.
An underwriter is a company or other entity that administers the public issuance and distribution of securities from a corporation or other issuing body.
Securities underwriting refers to the process by which investment banks raise investment capital from investors on behalf of corporations and governments that are issuing securities (both equity and debt capital). The services of an underwriter are typically used during a public offering in a primary market.